CHOUGH: implementation and performance of a high-order 4m AO demonstrator

Nazim A. Bharmal; Alastair G. Basden; Cyril J. Bourgenot; Martin Black; Cornelis M. Dubbeldam; David M. Henry; Daniel Hölck-Santibanez; Timothy J. Morris; David J. Robertson; Jürgen Schmoll; Robert G. Talbot; Eddy J. Younger; Richard M. Myers

doi:10.1117/12.2231721

27 July 2016 CHOUGH: implementation and performance of a high-order 4m AO demonstrator

Nazim A. Bharmal, Alastair G. Basden, Cyril J. Bourgenot, Martin Black, Cornelis M. Dubbeldam, David M. Henry, Daniel Hölck-Santibanez, Timothy J. Morris, David J. Robertson, Jürgen Schmoll, Robert G. Talbot, Eddy J. Younger, Richard M. Myers

Author Affiliations +

Proceedings Volume 9909, Adaptive Optics Systems V; 990948 (2016) https://doi.org/10.1117/12.2231721
Event: SPIE Astronomical Telescopes + Instrumentation, 2016, Edinburgh, United Kingdom

Abstract

CHOUGH is a small, fast project to provide an experimental on-sky high-order SCAO capability to the 4.2m WHT telescope. The basic goal has r₀-sized sub- apertures with the aim of achieving high-Strehl ratios (> 0:5) in the visible (> 650 nm). It achieves this by including itself into the CANARY experiment: CHOUGH is mounted as a breadboard and intercepts the beam within CANARY via a periscope. In doing so, it takes advantage of the mature CANARY infrastructure, but add new AO capabilities. The key instruments that CHOUGH brings to CANARY are: an atmospheric dispersion compensator; a 32 × 32 (1000 actuator) MEMS deformable mirror; 31 × 31 wavefront sensor; and a complementary (narrow-field) imager. CANARY provides a 241-actuator DM, tip/tilt mirror, and comprehensive off-sky alignment facility together with a RTC. In this work, we describe the CHOUGH sub-systems: backbone, ADC, MEMS-DM, HOWFS, CAWS, and NFSI.

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Nazim A. Bharmal, Alastair G. Basden, Cyril J. Bourgenot, Martin Black, Cornelis M. Dubbeldam, David M. Henry, Daniel Hölck-Santibanez, Timothy J. Morris, David J. Robertson, Jürgen Schmoll, Robert G. Talbot, Eddy J. Younger, and Richard M. Myers "CHOUGH: implementation and performance of a high-order 4m AO demonstrator", Proc. SPIE 9909, Adaptive Optics Systems V, 990948 (27 July 2016); https://doi.org/10.1117/12.2231721

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